powerpc/64: Only WARN if __pa()/__va() called with bad addresses

We added checks to __pa() / __va() to ensure they're only called with
appropriate addresses. But using BUG_ON() is too strong, it means
virt_addr_valid() will BUG when DEBUG_VIRTUAL is enabled.

Instead switch them to warnings, arm64 does the same.

Fixes: 4dd7554a6456 ("powerpc/64: Add VIRTUAL_BUG_ON checks for __va and __pa addresses")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220406145802.538416-5-mpe@ellerman.id.au

diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
index b3101ff..e5f75c7 100644 (file)
--- a/arch/powerpc/include/asm/page.h
+++ b/arch/powerpc/include/asm/page.h
@@ -216,6 +216,9 @@ static inline bool pfn_valid(unsigned long pfn)
 #define __pa(x) ((phys_addr_t)(unsigned long)(x) - VIRT_PHYS_OFFSET)
 #else
 #ifdef CONFIG_PPC64
+
+#define VIRTUAL_WARN_ON(x)     WARN_ON(IS_ENABLED(CONFIG_DEBUG_VIRTUAL) && (x))
+
 /*
  * gcc miscompiles (unsigned long)(&static_var) - PAGE_OFFSET
  * with -mcmodel=medium, so we use & and | instead of - and + on 64-bit.
@@ -223,13 +226,13 @@ static inline bool pfn_valid(unsigned long pfn)
  */
 #define __va(x)                                                                \
 ({                                                                     \
-       VIRTUAL_BUG_ON((unsigned long)(x) >= PAGE_OFFSET);              \
+       VIRTUAL_WARN_ON((unsigned long)(x) >= PAGE_OFFSET);             \
        (void *)(unsigned long)((phys_addr_t)(x) | PAGE_OFFSET);        \
 })
 
 #define __pa(x)                                                                \
 ({                                                                     \
-       VIRTUAL_BUG_ON((unsigned long)(x) < PAGE_OFFSET);               \
+       VIRTUAL_WARN_ON((unsigned long)(x) < PAGE_OFFSET);              \
        (unsigned long)(x) & 0x0fffffffffffffffUL;                      \
 })